solr java.net.NoRouteToHostException: Cannot assign requested address 错误

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本文介绍了解决使用SolrJ对SolrCloud进行索引时遇到的Cannotassignrequestedaddress异常的方法。通过调整TCP参数，如tcp_syncookies、tcp_tw_reuse等，有效解决了因TIME_WAIT状态过多而导致的问题。

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使用solrj对solr cloud建索引时，发生Cannot assign requested address异常

Caused by: java.net.NoRouteToHostException: Cannot assign requested address
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:640)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
        at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:395)
        ... 9 more

google之后发现是存在大量TIME_WAIT导致端口被用尽了，详情见

http://qa.blog.163.com/blog/static/1901470022011822105451572/

和

http://www.speedguide.net/articles/linux-tweaking-121

修改了

net.ipv4.tcp_syncookies = 1 （某些情况下该参数已启用）
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30

四个参数后，回复正常。

修改方式也可参照

http://www.frontopen.com/1219.html